Reversing-gear for compound steam-engines.



No. 689,875 Patented Dec. 3!, I901. L. HAHNE.

REVEBSING GEAR FOR COMPOUND STEAM ENGINES.

7 (Application Med May 4, 1901.) (No Model.) 6 ShaetsSheet I.

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4 No. 689,875. Patented Dec. 3|, I90I.

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REVERSING GEAR FOR COMPOUND STEAM ENGIflES.

(Application filed Kay 4, 1901.) (No Model.) 6 Sheets-Sheet 2.

- Patented Dec. 3|, I90l. LJIAHNE. BEVERSING GEAR FOB COMPOUND STEAMENGINES.

(Applicatiun filed my 4, 1901.)

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No. 689,875. Patented Dec. 3|, l90l. I

L. HAHNE.

BEVEBSING GEAR FOR COMPOUND STEAM ENGINES.

(Application filed May 4, 1901f) (No Model.) 6 Shaets$heet 4.

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- No. 689,875. Patonted Dec. s -19m.

L. HAHNE.

BEVERSING GEAR FOB COMPOUND STEAM ENGINES.

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' www No. 689,875. Patented Dec. 3|, I90l. L. HAHNE.

BEVEBSING GEAR FOB GOIPOUND STEAM ENGINES. (Applicltiun mm I 4, 1901.)

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OM W j)! UNITED- STATES PATE T 'FFICE.

LOUIS HAIINE, OF OASSEL, GERIVIANY.

REVERSING-GEAR FOR COMPOUND STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent N 0. 689,875, datedDecember 31, 1901.

Application filed May 4, 1901. Serial No. 58.714. (No model.)

To all whom it may concern:

Be it known that I, LOUIS HAHNE, a subject of the King of Prussia,Emperor of Germany, residing at Oassel, in the Kingdom of Prussia,Germany, have invented certain new and useful Improvements inReversing-Gears for Compound Steam-Engines, of which the fol lowing is'aspecification.

In order With compound engines to be able to makethe low-pressurecylinder work with the same degree of filling whether running I forwardor backward and at ever de ree of cut-oif in the highpressure cylinder,the valve-gear of the low-pressu re cylinder must be in so farindependent of that of the highpressure cylinder that when reversing theengine at whatever degree of cut-off for the highpressure cylinder, thelow-pressure-cylinder valve-gear must always allow of the same degree offilling. This was heretofore effected by causing the driver to actuatethe valvegear of each cylinder directly, both being mounted on one andthe same counter-shaft. According to the present invention suchcounter-shaft common to both valve-gears is done away with, thevalve-gears of the two' cylinders being entirely separate and thatof thelow-pressure cylinder being actuated automatically-by the-piston of afluid-pressure cylinder, the starting of which is controlled by thehand-lever of the valve-gear of the high-pressure cylinder.

I will describe the said invention with reference to the accompanyingdrawings, in which-- v Figure 1 shows a side view of the reversing-gear;Fig. 2, a side View of the mechanism-for actuating the valve-gear of thelowpressure cylinder; Fig. 3, the same view to an enlarged scale; Fig.4,a section on line A A,

Fig. 3; Fig. 5, a front view of the mechanism; Fig. 6, a general sideView of the Whole apparatus; Fig. 7, a section through the four-way cockfor the pressure-fluid supply for the auxiliary cylinder; Fig. 8, thereversing device for the four-way-cock plug. Fig. 9 is avertical sectionthrough the hi gh-pressure cylinder of a locomotive, showing itsvalve-gear; Fig. 10, a vertical section through the lowpressurecylinder, showing its valve-gear; Fig. 11, a cross-section on linell 11,Fig. 9; Fig. 12, a side elevation'of'the four-way cock 0., and Fig. 13 afront elevation of the same.

the cross-heads DD and the pitmen E E to the c'rank pins S. S of thedriving-wheels F F of the-locomotive. To control the admission andexhaust of the steam to and from the cylinders, slide-valves G G areprovided and mounted in the usual steam-chests T T These slide-valves GG having the-valverods H H are moved to and fro by means of any ofwthewell-known types of reversinggearings used for compound locomotives. In

\ the accompanying drawings I have illustrated the gearing type ofHeusinger von Waldegg. The valve -rods H H receive motion fromcrank-pins U U 2 by connecting-rods M M connecting-links K K andconnecting-rods I 1 on one hand, and from the cross-heads D D by'co'nnectingfrods V V and levers N N on the other hand.

To reverse the engine or to change the degree of filling ofthehigh-pressure cylinder, the angle-lever O is provided, which, entirelyindependent" of the gearing of the low-pressure cylinder, is moved inthe usual manner from the cab by a connecting-rod Q, and thus transfersits motion by rod P to the connecting-rod I, and thereby to theslide-valve G. To the center of the frame of the said reversing-gear inthe cab is fixed a four-way cook a, which is connected by a pipe I) witha reservoir of pressure fluid. This cock is connected by pipes 17 b withthe two ends of an auxiliary cylinder 0, mounted outside the cab, whilepipe 19 connects cook a with the open air. The plug a, of the cook a,having the necessary lateral ports, is provided with two arms a a To thescrew-nut a of the reversing-gear spindle or to the hand-lever issecured an arm 01, having a pin d. The pin d, when moving with thescrew-nut in the direction of arrow 8, pushes down arm a and therebyturns the plug a. into one end position, while if the pin 01 moves withthe screw-nut in direction of arrow 15 it pushes down arm a and therebyturns the plug a in the other end position. If the arm a is pushed down,communication is established between the fluid-pressure reservoir andthe end 0 of cylinder 0 by pipes l) I), while the end 0 communicates bypipes b If with the open air. If the arm (L2 is pushed down by theopposite motion of pin (1, communication is established between thefluid-pressure reservoir and the end 0 of the cylinder 0 by pipes'b bwhile the end 0 communicates by pipes b b with the open air.

The air-pressure or steam admitted to the cylinder 0 acts upon thepiston 6, whose slotted piston-rod s, guidedat g, embraces theelbowlever 7b. With this is connected a rod n,which serves to raise andlower the slide-valve rod in the usual link-motion. The lever h isjournaled at z and works between two guides Z, which are provided with anotch at each end for the engagement of the spring-catch t ion the.lever 71 for holding the latter securely in itsend positions. Forraising the catches it out of engagement there are provided on the leverh two small pivoted elbow-levers 7t 7;, whose short arms are engaged inslots in the catches t t, which are pressed downward by springs ff.Against the levers 7t bear the projecting ends of the pinsp of therollers r, situated in the slot of the piston-rod s, for actuating thereversing-lever h. The pipes Z) and b are provided with drain-cocks m attheir deepest points for discharging water of condensation when steam isused as the pressure fluid.

By the above construction the valve-gear of the low-pressure cylinder Ain effecting the forward or backward motion of the comotive is alwaysarrested in one of its nd positions. In this way the low-pressureiylinder always works with the most advantageous degree of fillingindependent from the degree of filling of the high-pressure cylinder. Ifthe direction of motion of the locomotive is to be changed and theanglelever O of the high valve-gear A, and therewith the screw-nut a, ismoved for this purpose over its middle position, the cock a is turned bythe above-described arrangement of the pin d, and in this waycommunication between the fluid-pressure reservoir and one end ofcylinder 0 is established, and therefore the piston c is pushed to theother end of the cylinder, even though the nut or is moved only a littleover its middle position. Thus the slide-valve of the low-pressurecylinder is fully opened independent of the opening of the slide-valveof the high-pressure cylinder.

The action of the above-described apparatus is as follows: When thescrew-nut of the reversing-gear spindle or the drivers handle is movedforward in direction of arrow 5 for bringing the valve-gear of thehighpressure cylinder into position for forward motion in the usualmanner, the carrier-pin d, by passing the middle of the frame, takesalong the arm a of the plug a and turns it into its one end position. Inthis way corn-v munication is established between the fluidpressurereservoir and the end 0' of the auxes9,s75

iliary cylinder 0 by pipes b I), while the end 0 of said cylindercommunicates with the open air by pipes 11 If. The fluid-pressureentering end 0 of the cylinder and pressing on piston c forces thelatter forward, the fluid on the other side of piston e at the same timesetting the valve-gear of the low-pressure cyl-\.

inder for effecting the complete filling of the latter. The parts areheld in this position by the engagement of the catches tin the othernotches of the guides. At the same time by means of the screw spindleand nut the valvegear of the high-pressure cylinder can be adjusted toany desired degree of cut-01f. On the reversal of the motion of thescrew spindle and nut the valve-gear of the low-pressure cylinder isactuated in the same manner as above described in the oppositedirection.

Having thus described my invention, I claim as now and desire to secureby Letters Patent 1. In a reversing-gear for compound steam engines, thecombination of high and low pressure cylinders, steam-chests, and valveswith an auxiliary piston adapted to be set by the reversing gear of thehigh pressure cylinder, a reversing-lever actuated by said pistongandwith means for connecting said lever to the valve-gear of thelow-pressure cylinder, substantially as specified.

2.1111 a reversing-gear for compound steamengines, the combination ofhigh and low pressure cylinders, steam-chests, and valves with anauxiliary piston adapted to be set by the reversing-gear of thehigh-pressure cylinder, a reversing-lever actuated by said piston,

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spring-catches on the lever, means on the piston rod for operating saidcatches, a notched guide adapted to be engaged by the catches, and meansfor connecting the reversin g-lever to the val ve-gear of thelow-pressure cylinder, substantially as specified.

3. In areversing-gear for compound steamengines, the combination of highand low pressure cylinders, steam-chests, and valves with a cock adaptedto be set by the reversinggear of the high-pressure cylinder, a pressurereservoir and pipes, an auxiliary cylinder communicating therewith, apiston within said cylinder, a reversing-lever actuated by said piston,and means for connecting said lever to the valve-gear of thelow-pressure cylinder, substantially as specified.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

LOUIS HAI-I'NE.

W'itnesses:

HEINRICH GRAU, Orro LEIDEMANN.

